Create a function that returns an array of all the integers between two given numbers $start and $end.
rangeOfNum(2, 4) ➞ [3]
rangeOfNum(5, 9) ➞ [6, 7, 8]
rangeOfNum(2, 11) ➞ [3, 4, 5, 6, 7, 8, 9, 10]$start will always be <= $end.$start and $end are NOT included in the final array.$start == $end, return an empty array.